I recently purchased a great hair dryer that blows out my hair straight enough for me not to need to use straighteners after, it's the Parlux 3000, this make is used by many stylists in Europe and it was when I saw the results after my stylist used it that I just had to have one. Although it's a form of direct heat, it was cutting out my need to use an even more damaging type of direct heat and also the amount of time I spent blow drying. I would go through my hair in sections on low heat, once it was dry I would turn up the heat and this would leave my hair straight, so it's a case of the lesser of two evils. I have only used this dryer up to 12 weeks post but it still straightened my roots, I use the short Willie Morrows hair pik with it.
The problems I have with blow drying stretched/transitioning hair is that it is too much manipulation and direct heat, that's why I didn't use it past 12 weeks post. I just feel that blow drying (especially regularly) during a stretch/transition is a breakage setback waiting to happen and my goal is retention.
The brush attachment sounds like you would need to use the tension method (someone please correct me if I'm wrong), again that's way too much manipulation for me. I'm sure there'll be plenty others who can chime in with advice on ways you can blow dry without needing to use straighteners. HTH
